Rio Aros

Jaguars are endangered in Mexico and the United States, necessitating careful monitor- ing of population status. We determined minimum numbers of jaguars and sympatric pumas in a small population in northern Sonora, Mexico, the nearest known breeding population to the United States, by photographic captures supplemented by idiosyncratic features of tracks from track surveys (1999-2005). We also developed a discriminant function to differentiate species (jaguar v. puma) and sexes within species, which also aided in individual identification.

Trip report on 2005 biological inventory of the Rio Aros and Yaqui from Natora, Sonora to Sahuaripa. Rafts and inflatable kayaks were used to gain access to this remote and rugged area. Trip participants included Aaron Flesch, Lane Larsen, Samia Carrio-Percastegui, Chris O'Brien, Michael Bogan, Eric Wallace, and Sky Jacobs, among others.